# CVE-2026-85021: langgenius dify Splash Layout splash.tsx router.replace cross site scripting

> Remote attackers can execute arbitrary scripts via the redirect_url parameter in the Splash Layout component of the Dify web application.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 3 Sep 2026
- **Updated:** 3 Sep 2026
- **Also known as:** GHSA-7qgm-pqv4-668x, GHSA-mf5r-rpc2-6jqp

## What is CVE-2026-85021?

CVE-2026-85021 is a medium-severity cross-site scripting vulnerability in langgenius dify, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability was determined in langgenius dify 1.13.0. Affected is the function router.replace of the file web/app/(shareLayout)/components/splash.tsx of the component Splash Layout. This manipulation of the argument redirect_url causes cross site scripting. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-85021?


## How do I fix CVE-2026-85021?

No fix has been published for CVE-2026-85021 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-85021 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85021 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85021 and fix it if it is affected.

What it is: CVE-2026-85021 is a medium-severity cross-site scripting vulnerability in langgenius dify, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85021 exists.

Affected product: langgenius dify. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-85021/ (Markdown: https://insights.sbomify.com/CVE-2026-85021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85021
- OSV: https://osv.dev/vulnerability/CVE-2026-85021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-85021/
Summaries are generated and may contain mistakes; the official description above is the record.